Section 17.1
-Positive and negative charges are opposite
-When the electrons in an atom are balanced by an equal number of protons, the atom has no net charge.
-Milikan's oil drop experiment: determined that charge occurs as discrete amounts in matter.
-Conductors: transfer charge easily (ex: metals)
-insulators: do not transfer charge easily
-insulators and conductors can be charged by contact
conductors can be charged by induction
Particle
Charge (c)
Mass (kg)
e-
-1.60x10^-19
9.109x10^-31
p+
1.60x10^19
1.673x10^-27
n
0
1.675x10^-27
-Induction: the process of charging a conductor by bringing it near another charged object
-Polarization: centers of neutral atoms or molecules may shift so that one side is more charged than the other
Section 17.2:
-The closer 2 objects are, the greater the force is between them
-If a charge is doubled, electric force doubles
-Distance between 2 objects is halved if force is 4x
Coulomb's law:
-Felectric is much stronger than Fgravitational
-Resultant force on a charge is the vector sum of the individual forces on that charge
Section 17.3:
-Electric Field: a region in space around a charged object in which stationary charged object experiences an electric force b/c of its charge.
-Electric field strength depends on charge and distance Magnitude:
Strength:
-Electric Charge from a point charge is:
if q is positive, the field lines due to this charge is directed outward radially from q
-Rules for drawing electric field lines:
1. same direction
2. Number of lines leaving is proportional to the magnitude of charge
3. No 2 field lines can cross each other -Conductors in electrostatic equlibrium:
1.electric field is zero everywhere inside conductor
2.any excess charge on an isolted conductor reticles entirely on conducctor's outersurface
3.electric field just outside
"Chapter 17: Electric Forces and Fields." Holt Online Learning. 5 June 2009 <my.hrw.com/tabnav/controller.jsp?isbn=0030724864>.
Chapter 17:
Section 17.1
-Positive and negative charges are opposite
-When the electrons in an atom are balanced by an equal number of protons, the atom has no net charge.
-Milikan's oil drop experiment: determined that charge occurs as discrete amounts in matter.
-Conductors: transfer charge easily (ex: metals)
-insulators: do not transfer charge easily
-insulators and conductors can be charged by contact
conductors can be charged by induction
-Polarization: centers of neutral atoms or molecules may shift so that one side is more charged than the other
Section 17.2:
-The closer 2 objects are, the greater the force is between them
-If a charge is doubled, electric force doubles
-Distance between 2 objects is halved if force is 4x
Coulomb's law:
-Felectric is much stronger than Fgravitational
-Resultant force on a charge is the vector sum of the individual forces on that charge
Section 17.3:
-Electric Field: a region in space around a charged object in which stationary charged object experiences an electric force b/c of its charge.
-Electric field strength depends on charge and distance
Magnitude:
Strength:
-Electric Charge from a point charge is:
if q is positive, the field lines due to this charge is directed outward radially from q
-Rules for drawing electric field lines:
1. same direction
2. Number of lines leaving is proportional to the magnitude of charge
3. No 2 field lines can cross each other
-Conductors in electrostatic equlibrium:
1.electric field is zero everywhere inside conductor
2.any excess charge on an isolted conductor reticles entirely on conducctor's outersurface
3.electric field just outside
"Chapter 17: Electric Forces and Fields." Holt Online Learning. 5 June 2009 <my.hrw.com/tabnav/controller.jsp?isbn=0030724864>.